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--></style><title>A quick! update on North American
forests</title></head><body>
<div><font face="Geneva" size="-1">Anderegg et al cite recent
widespread, drought-driven dieoff in a widespread North American tree,
the aspen. Berdanier and Clark in press, cite recent widespread.
drought-driven dieoff across several tree species of the Southeast US.
Science just published a scenario of the boreal forest becoming a
savannah, and, according to a news release I saw somewhere, another
journal had earlier published a scenario, at boreal latitudes, of
aspen expansion following dieoff of the currently competing
conifers.</font></div>
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"</font><font face="Lucida Grande" size="-1" color="#141413">We find
that hydraulic damage persisted and increased in dying trees over
multiple years and exhibited few signs of repair Š.
Contrary to the expectation that surviving trees have weathered severe
drought, the hydraulic deterioration demonstrated here reveals that
surviving regions of these forests are actually more vulnerable to
future droughts due to accumulated xylem damage."<br>
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WILLIAM R. L. ANDEREGG et al. Drought's legacy: multiyear hydraulic
deterioration underlies widespread aspen forest die-off and portends
increased future risk.<i> Global Change Biology</i> (2013) 19,
1188-1196, doi: 10.1111/gcb.12100<br>
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